ARM-based CPU vs X86-64 CPU - I don't think you can reasonably draw any comparisons between the 2, if you are given the actual speeds. Different architectures, different instruction sets, etc. Apples to oranges comparisons, really....
To be fair, even with Intel CPUs, the traditional “more GHz is better” hasn’t been true for a while (I’m just talking consumer chips here) and that’s been confusing enough for people who are wondering why brand new laptops appear to be using slower chips than their 5 year old one.